Try the IE8 debugger, it's pretty good. You're using the compressed
version of jQuery so that is hard to debug, but it the debugger shows
the call stack at the point of the error and it leads to this line in
your page:
$("#magnifier").css({display:"block",top:(e.pageY-$(this).css
("width"))+"px",left:(e.pageX-$(this).css("height"))+"px"});
The width and height css attributes are returning "auto" instead of a
number of pixels (that's an IE quirkiness), which is causing a math
error and it ends up trying to set the top to "NaNpx".
Try $(this).height() and $(this).width() instead, they should return a
number in pixels--unless they are nested inside an element that is
hidden, and I don't think that applies here.
Cool magnifier!
